c++ Botan cryptography libraries, botan TLS.

Build and Install Botan

Get botan

https://botan.randombit.net

https://github.com/randombit/botan

Build botan

> cd botan
> ./configure.py --with-boost --prefix=/sand
> make -j2

Install botan

> su
# make install

Use Botan

Botan::BigInt example.

#include <botan/bigint.h>
#include <iomanip>
#include <iostream>

int main()
{
	Botan::BigInt n1{"0x8ff27ff3f4f93ffff6786f1239ade4"};
	Botan::BigInt n2{"0x5ab4cee943253deef82a873af33f6f"};
	Botan::BigInt n3 = n1 + n2;

	std::cout
		<< std::right << std::setw(40)
		<< n1.to_dec_string() << std::endl
		<< "+" << std::endl
		<< std::right << std::setw(40)
		<< n2.to_dec_string() << std::endl
		<< "||" << std::endl
		<< std::right << std::setw(40)
		<< n3.to_dec_string() << std::endl
	;
}

Compile It

> alias gpp="g++ -std=c++26"
> gpp prog.cpp -o prog -I /sand/include/botan-3 -lbotan-3
> ./prog

Result:

    747416931372215703109324736466365924
+
    470973944189450914015995221198978927
||
   1218390875561666617125319957665344851

Date

Apr 12, 2025

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